Koshiro Izumi, Koushiro Izumi, Koshiro "Izzy" Izumi, and Izzy Izumi can refer to the following characters:
- Koushiro "Izzy" Izumi, one of the main protagonists of Digimon Adventure and Digimon Adventure tri., a supporting character in Digimon Adventure 02, and a character in many video games, movies, and manga, whose original name is Kōshirō Izumi.
- Koushiro "Izzy" Izumi, one of the main protagonists of Digimon Adventure:, whose original name is Koshiro Izumi.
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